Cognomen Siirak (Siirak 
) , worldwide, is a rare last name. The cognomen Siirak is habitual in Estonia, where it is quite a rare surname, Norway, where it is a very rare surname, and Germany. In absolute terms, it is commonest in Estonia, Germany, and the United Kingdom.
| arnold siirak Estonian composer, EE (b. 1900) |
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| jaan siirak EE (b. 1897) |
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| erna siirak Estonian literary scholar, EE (b. 1911) |
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| juta siirak EE (b. 1929) |
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| roman siirak (b. 1929) |
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